Pseudoimaging Optical Receiver System for Clutter Mitigation
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Solution Overview
Problem
Object detection systems, such as radar and LIDAR, face performance issues due to clutter, particularly in littoral environments where wave clutter impairs the detection of objects like periscopes.
Innovation Solution
An optical detection system using an eye-safe laser to emit a diverging laser flash and a pseudoimaging optical receiver system with a time-gated photodetector array to detect reflections, processing voxel arrays to differentiate between target signals and clutter signals, and employing voxel change detection to identify potential targets based on temporal voxel signatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar or LIDAR systems are used for object detection, then detection capability is provided, but clutter (especially wave clutter in littoral environments) causes serious performance issues and false positives
Solution Approach 1:
The system segments the detection space into discrete voxels (volume elements) and processes reflections from each voxel independently. By dividing the detection zone into manageable spatial units and analyzing temporal sequences of voxel arrays, the system can identify coherent target signatures against the background of incoherent clutter reflections, thereby improving detection reliability in cluttered environments.
Solution Approach 2:
The system employs periodic laser illumination pulses to probe the detection zone and captures temporal sequences of reflections at regular intervals. By using periodic action with pulse repetition and temporal gating, the system accumulates multiple voxel arrays over time to enhance target detection through temporal coherence analysis while suppressing random clutter.
2Productivity
If traditional detection methods are used, then objects can be detected, but false positives increase in cluttered environments
Solution Approach 1:
The system incorporates feedback mechanisms by comparing detected voxel patterns against stored signatures of known target types. The voxel processing module uses reference clutter signals and temporal coherence analysis to feedback-correct detection decisions, continuously refining target discrimination by comparing observed reflections with expected target signatures and adjusting detection thresholds accordingly.
Solution Approach 2:
The system transitions from traditional two-dimensional imaging to three-dimensional voxel-based detection by adding the temporal dimension. By detecting multiple retroreflections from a single ocular body across different time gates and spatial positions, the system creates a fourth dimension of temporal-spatial signatures that enables more accurate target discrimination and reduces false positives.
3Illumination intensity
If laser illumination is used to illuminate the detection zone, then target detection is enabled, but eye safety must be maintained
Solution Approach 1:
The system changes the parameters of laser illumination by using diverging beam geometry and temporal pulsing instead of continuous collimated beams. By employing eye-safe laser wavelengths and controlling pulse duration and energy density, the system maintains sufficient illumination intensity for detection while staying below eye safety thresholds. The diverging beam reduces power density at any single point, enabling safe operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively mitigates clutter, reducing false positives and increasing positive predictive values by accurately discriminating between target objects and clutter, enhancing the detection of high-brightness objects like retroreflectors in cluttered environments.
Implementation Method 1
an eye-safe laser is used to emit a diverging laser flash configured to illuminate a detection zone
Implementation Method 2
A pseudoimaging optical receiver system is used to detect reflections from objects in the detection zone. The receiver system includes a time-gated photodetector array that is used to record signatures in a voxel array.
Data Source
AI summary
A laser is used to emit a diverging laser flash configured to illuminate a detection zone. A pseudoimaging optical receiver system is used to detect reflections from objects in the detection zone. The receiver system includes a time-gated photodetector array that is used to record signatures in a voxel array. A voxel processing module receives the voxel array and detects a reference clutter signal within the array. Potential targets are then detected according to target signals in relation to the reference clutter signal.